.JOZ File Extension

Java OpenStreetMap Session

Developer OpenStreetMap
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What is a JOZ file?

A JOZ file contains a saved Java OpenStreetMap (JOSM) session. It is a renamed .ZIP file that contains the session's metadata (saved in a .JOS file) and .OSM layer data (saved in individual directories). When opened with JOSM, JOZ files appear as one or more map layers.

More Information

Screenshot of a .joz file in Java OpenStreetMap
JOZ file open in Java OpenStreetMap

Java OpenStreetMap is a free OpenStreetMap map (OSM file) editor available for Windows, macOS, and Linux. It allows users to download or import OSM maps, mark them up with tagged nodes and paths, and submit their edits to the official OpenStreetMap project.

While editing maps, users can save their current Java OpenStreetMap session as a JOZ file. This allows them to re-open and continue editing that session in the future. JOZ files are ZIP archives that contain:

  • A JOS file, which is an XML file that describes a session's layers, viewport settings, and version
  • One or more OSM files, stored in sub-directories that correspond to the session's layers

How to open a JOZ file

You can open a JOZ file with Java OpenStreetMap (JOSM), to view and edit the session it contains:

  1. In JOSM, select File → Open....
  2. Navigate to and open your JOZ file.

If you want to extract the OSM files and other data a JOZ file contains, you can do so by:

  1. Renaming the file to use the .ZIP extension.
  2. Opening it as you would any ZIP file.
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Programs that open JOZ files

Windows
Any Zip-decompression utility
Mac
Any Zip-decompression utility
Linux
Any Zip-decompression utility
Category: GIS Files
Updated: November 16, 2023

Verified by FileInfo.com

The FileInfo.com team has independently researched the Java OpenStreetMap Session file format and Mac, Windows, and Linux apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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